Aluminum door and window systems play a crucial role in modern architecture. Beyond appearance, their performance determines safety, comfort, and long-term durability. Below are the essential KPIs that define a high-quality system and guide product selection for global construction projects.

1. Air Tightness
Air tightness prevents unwanted air, dust, and pollutants from entering a building.
A good system offers:
• Reduced air leakage
• Improved energy efficiency
• More stable indoor comfort
2. Water Tightness
This measures the system’s ability to resist water penetration under pressure.
Reliable systems provide:
• Multi-layer sealing
• No leakage during heavy rain
• Long-term protection for both low-rise and high-rise buildings
3. Wind Load Resistance
A key indicator of structural safety.
High wind resistance ensures:
• Stable performance under wind pressure
• Resistance to deformation
• Compliance with international building standards
4. Thermal Insulation
Energy efficiency is a global priority.
Thermal break systems with PA66 insulation strips and insulated/Low-E glass help:
• Reduce heat transfer
• Lower energy consumption
• Enhance sustainability and interior comfort
5. Sound Insulation
Acoustic comfort matters in residential and commercial environments.
High-quality systems use:
• Laminated or double glazing
• Optimized profile chambers
• High-performance gaskets
to effectively reduce noise.
6. Structural Strength
The wall thickness, alloy grade, and profile design determine overall stability.
Strong structures ensure smooth operation and long service life.
7. Surface Finish Durability
Surface treatment protects the aluminum from corrosion and fading.
Common options include anodizing, electrophoresis, powder coating, PVDF, and wood grain.
A durable finish ensures long-term appearance and weather resistance across different climate zones.
To achieve these performance standards, choosing a reliable aluminum profile supplier is essential.
At Shandong Kangdi Aluminum, we provide stable-quality aluminum profiles supported by complete production lines, strict quality control, and extensive global export experience.
Our goal is to ensure that every project can benefit from consistent performance, long-term durability, and trusted technical support.
We are committed to supporting fabricators, distributors, and project contractors worldwide.
Feel free to contact us for catalogs, samples, or customized technical solutions.